/
diskrpcservice.go
167 lines (154 loc) · 4.21 KB
/
diskrpcservice.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package driverd
import (
"context"
"fmt"
"time"
diskrpc "github.com/aleofreddi/csi-sanlock-lvm/pkg/diskrpc"
pb "github.com/aleofreddi/csi-sanlock-lvm/pkg/proto"
"k8s.io/klog"
)
// DiskRpcService adapts DiskRpc to use volume locking.
type DiskRpcService struct {
baseServer
diskrpc.DiskRpc
mailBox diskrpc.MailBox
}
type RpcRole string
const (
rpcRoleLock RpcRole = "lock"
rpcRoleData RpcRole = "data"
diskRpcOp = "diskRpc"
maxRpcRetryDelay = 120 * time.Second
)
type volumeLockerAdapter struct {
locker VolumeLocker
ctx context.Context
vol VolumeRef
}
func (vl *volumeLockerAdapter) Lock() {
for delay := 1 * time.Second; ; {
err := vl.locker.LockVolume(vl.ctx, vl.vol, diskRpcOp)
if err == nil {
return
}
klog.Warningf("Failed to acquire RPC lock (retry in %s): %v", delay, err)
time.Sleep(delay)
if delay < maxRpcRetryDelay {
delay *= 2
}
}
}
func (vl *volumeLockerAdapter) Unlock() {
for delay := time.Duration(1); ; {
err := vl.locker.UnlockVolume(vl.ctx, vl.vol, diskRpcOp)
if err == nil {
return
}
klog.Warningf("Failed to release RPC lock (retry in %s): %v", delay, err)
time.Sleep(delay)
if delay < maxRpcRetryDelay {
delay *= 2
}
}
}
func NewDiskRpcService(lvmctrld pb.LvmCtrldClient, locker VolumeLocker) (*DiskRpcService, error) {
bs, err := newBaseServer(lvmctrld)
if err != nil {
return nil, err
}
// Find rpc lock and data logical volumes.
ctx := context.Background()
lvs, err := lvmctrld.Lvs(ctx, &pb.LvsRequest{
Select: fmt.Sprintf("lv_tags=%s || lv_tags=%s",
encodeTagKV(rpcRoleTagKey, string(rpcRoleData)),
encodeTagKV(rpcRoleTagKey, string(rpcRoleLock))),
})
if err != nil {
return nil, fmt.Errorf("failed to list logical volumes: %v", err)
}
var data *VolumeInfo
var lock *VolumeInfo
for _, lv := range lvs.Lvs {
lvRef := NewVolumeInfoFromLv(lv)
tags, err := lvRef.Tags()
if err != nil {
return nil, fmt.Errorf("failed to decode tags for volume %q: %v", lvRef, err)
}
role := RpcRole(tags[rpcRoleTagKey])
if role == rpcRoleLock {
if lock != nil {
return nil, fmt.Errorf("found multiple logical volumes tagged with the %s RPC role", rpcRoleLock)
}
lock = lvRef
} else if role == rpcRoleData {
if data != nil {
return nil, fmt.Errorf("found multiple logical volumes tagged with the %s RPC role", rpcRoleData)
}
data = lvRef
}
}
if lock == nil || data == nil {
return nil, fmt.Errorf("missing lock or data logical volumes (expected [%s%s, %s%s] tags)",
encodeTagKeyPrefix(rpcRoleTagKey), rpcRoleData,
encodeTagKeyPrefix(rpcRoleTagKey), rpcRoleLock)
}
// Activate data as shared.
_, err = lvmctrld.LvChange(ctx, &pb.LvChangeRequest{
Target: []string{data.VgLv()},
Activate: pb.LvActivationMode_LV_ACTIVATION_MODE_ACTIVE_SHARED,
})
if err != nil {
return nil, fmt.Errorf("failed to activate rpc data logical volume: %v", err)
}
// Instance mailbox.
mb, err := diskrpc.NewMailBox(
diskrpc.MailBoxID(bs.nodeID),
&volumeLockerAdapter{
ctx: ctx,
locker: locker,
vol: lock.VolumeRef,
},
data.DevPath(),
)
if err != nil {
return nil, fmt.Errorf("failed to instance mailbox: %v", err)
}
dRpc, err := diskrpc.NewDiskRpc(mb)
if err != nil {
return nil, fmt.Errorf("failed to instance diskrpc: %v", err)
}
return &DiskRpcService{
baseServer: *bs,
DiskRpc: dRpc,
mailBox: mb,
}, nil
}
func (s *DiskRpcService) Start() error {
go func() {
ctx := context.Background()
for {
err := s.Handle(ctx)
if err != nil {
klog.Errorf("DiskRpc failed to handle messages: %v", err)
}
select {
//case <-done: return // FIXME!
case <-time.After(1 * time.Second):
}
}
}()
return nil
}